Mesostructured carbon film with morphology-induced hydrophilic surface through a dewetting-free coating process
Mesostructured carbon film with morphology-induced hydrophilic surface through a dewetting-free coating process
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DOI：
10.1016/j.carbon.2014.06.028
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发表时间：
2014-10
期刊：
影响因子：
10.9
通讯作者：
Yasuaki Tokudome;K. Nakane;Masahide Takahashi
中科院分区：
文献类型：
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作者：
Yasuaki Tokudome;K. Nakane;Masahide Takahashi
由于碳表面的亲水性使得水/极性溶剂作为反应和/或分散介质成为可能，因此在许多应用领域都需要碳表面的亲水性。碳表面的化学修饰已经在以前的亲水性技术中得到应用，而没有表面修饰的其他亲水性途径预计会有相当大的优势，因为获得的碳保持固有的表面性质。在此，我们展示了具有良好介孔结构的介孔碳（MC）膜的结构导向亲水性。采用酚醛树脂在聚苯乙烯-聚苯乙烯- 4-乙烯基吡啶和孔膨胀剂的存在下进行有机-有机自组装制备了MC膜。采用1,3,5-三甲基苯和聚苯乙烯作为孔隙膨胀剂来控制介观结构。通过使用沸点相对较低的溶剂，从动力学上抑制了涂层的脱湿，这使得我们可以在各种类型的衬底上沉积MC薄膜。以1,4-二恶烷和甲苯为涂膜溶剂时，所制得的MC膜的水接触角小于30°。所得碳膜的碳片在水中表现出良好的分散性，形成均匀的水分散体。
Hydrophilization of carbon surface is demanded in various application fields because it makes possible to employ aqueous/polar solvents as reaction and/or dispersion media. Chemical modifications of the carbon surface have been applied in previous hydrophilization techniques, whereas alternative hydrophilization pathway free from the surface modifications is expected to give considerable advantage because the obtained carbons keep inherent surface properties. Herein, we demonstrate structure-directed hydrophilization of mesoporous carbon (MC) films with well-designed mesotextures. MC films were prepared via organic-organic self-assembly of a phenolic resin in the presence of poly(styrene)-b-poly(4-vinylpyridine) and pore swelling agents. 1,3,5-Trimethylbenzene and polystyrene were employed as the pore swelling agents to control the mesotextures. Dewetting upon coating was kinetically suppressed by using solvents with a relatively low boiling point, which allows us to deposit MC films on various types of substrates. The obtained MC films exhibit a water contact angle below 30° when 1,4-dioxane and toluene are employed as coating solvents. Carbon flakes obtained from the resultant carbon films show good dispersivity in water to yield a homogenous aqueous dispersion.